/Engine/Source/Runtime/Core/Public/Math/UnrealMathUtility.h
Assumes the cone tip is at 0,0,0 (means the SphereCenter is relative to the cone tip)
true: cone and sphere do intersect, false otherwise
static bool SphereConeIntersection ( const FVector & SphereCenter, float SphereRadius, const FVector & ConeAxis, float ConeAngleSin, float ConeAngleCos )